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</table></div><div></div></div></div></div><div class="t-navbar-sep"> </div><div class="t-navbar-head"><strong class="selflink"><tt>std::array</tt></strong><div class="t-navbar-menu"><div><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv-h1"><td colspan="5"> 成员函数</td></tr>
<tr class="t-nv-h2"><td colspan="5"> 元素访问</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="array/at.html" title="cpp/container/array/at"><span class="t-lines"><span>array::at</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="array/operator_at.html" title="cpp/container/array/operator at"><span class="t-lines"><span>array::operator[]</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="array/front.html" title="cpp/container/array/front"><span class="t-lines"><span>array::front</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="array/back.html" title="cpp/container/array/back"><span class="t-lines"><span>array::back</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="array/data.html" title="cpp/container/array/data"><span class="t-lines"><span>array::data</span></span></a></div></div></td></tr>
<tr class="t-nv-h2"><td colspan="5"> 迭代器</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="array/begin.html" title="cpp/container/array/begin"><span class="t-lines"><span>array::begin</span><span>array::cbegin</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="array/end.html" title="cpp/container/array/end"><span class="t-lines"><span>array::end</span><span>array::cend</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="array/rbegin.html" title="cpp/container/array/rbegin"><span class="t-lines"><span>array::rbegin</span><span>array::crbegin</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="array/rend.html" title="cpp/container/array/rend"><span class="t-lines"><span>array::rend</span><span>array::crend</span></span></a></div></div></td></tr>
<tr class="t-nv-h2"><td colspan="5"> 容量</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="array/empty.html" title="cpp/container/array/empty"><span class="t-lines"><span>array::empty</span></span></a></div></div></td></tr>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="array/max_size.html" title="cpp/container/array/max size"><span class="t-lines"><span>array::max_size</span></span></a></div></div></td></tr>
<tr class="t-nv-h2"><td colspan="5"> 修改器</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="array/fill.html" title="cpp/container/array/fill"><span class="t-lines"><span>array::fill</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="array/swap.html" title="cpp/container/array/swap"><span class="t-lines"><span>array::swap</span></span></a></div></div></td></tr>
<tr class="t-nv-h1"><td colspan="5"> 非成员函数</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="array/get.html" title="cpp/container/array/get"><span class="t-lines"><span>get</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="array/swap2.html" title="cpp/container/array/swap2"><span class="t-lines"><span>std::swap</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="array/to_array.html" title="cpp/container/array/to array"><span class="t-lines"><span>to_array</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="array/operator_cmp.html" title="cpp/container/array/operator cmp"><span class="t-lines"><span>operator==</span><span>operator!=</span><span>operator&lt;</span><span>operator&gt;</span><span>operator&lt;=</span><span>operator&gt;=</span><span>operator&lt;=&gt;</span></span></a></div><div><span class="t-lines"><span></span><span><span class="t-mark-rev t-until-cxx20">(C++20 前)</span></span><span><span class="t-mark-rev t-until-cxx20">(C++20 前)</span></span><span><span class="t-mark-rev t-until-cxx20">(C++20 前)</span></span><span><span class="t-mark-rev t-until-cxx20">(C++20 前)</span></span><span><span class="t-mark-rev t-until-cxx20">(C++20 前)</span></span><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div></td></tr>
<tr class="t-nv-h1"><td colspan="5"> 辅助类</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="array/tuple_size.html" title="cpp/container/array/tuple size"><span class="t-lines"><span>tuple_size</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="array/tuple_element.html" title="cpp/container/array/tuple element"><span class="t-lines"><span>tuple_element</span></span></a></div></div></td></tr>
<tr class="t-nv-h1"><td colspan="5"> <a href="array/deduction_guides.html" title="cpp/container/array/deduction guides">推导指引</a><span class="t-mark-rev t-since-cxx17">(C++17)</span></td></tr>
</table></div><div></div></div></div></div><div class="t-navbar-sep"> </div></div>
<table class="t-dcl-begin"><tbody>
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<td> <div>定义于头文件 <code><a href="../header/array.html" title="cpp/header/array">&lt;array&gt;</a></code>
 </div></td>
<td></td>
<td></td>
</tr>
<tr class="t-dcl t-since-cxx11">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <br>
<p>    <span class="kw1">class</span> T, <br>
    <a href="../types/size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> N <br>
</p>
<span class="sy1">&gt;</span> <span class="kw1">struct</span> array<span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td> <span class="t-mark-rev t-since-cxx11">(C++11 起)</span> </td>
</tr>
<tr class="t-dcl-sep"><td></td><td></td><td></td></tr>
</tbody></table>
<p><code>std::array</code> 是封装固定大小数组的容器。
</p><p>此容器是一个聚合类型，其语义等同于保有一个 <a href="../language/array.html" title="cpp/language/array">C 风格数组</a> <span class="t-c"><span class="mw-geshi cpp source-cpp">T<span class="br0">[</span>N<span class="br0">]</span></span></span> 作为其唯一非静态数据成员的结构体。不同于 C 风格数组，它不会自动退化成 <span class="t-c"><span class="mw-geshi cpp source-cpp">T<span class="sy2">*</span></span></span> 。它能作为聚合类型<a href="../language/aggregate_initialization.html" title="cpp/language/aggregate initialization">聚合初始化</a>，只要有至多 <code>N</code> 个能转换成 <code>T</code> 的初始化器： <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">array</span><span class="sy1">&lt;</span><span class="kw4">int</span>, <span class="nu0">3</span><span class="sy1">&gt;</span> a <span class="sy1">=</span> <span class="br0">{</span><span class="nu0">1</span>,<span class="nu0">2</span>,<span class="nu0">3</span><span class="br0">}</span><span class="sy4">;</span></span></span> 。
</p><p>该结构体结合了 C 风格数组的性能、可访问性与容器的优点，比如可获取大小、支持赋值、随机访问迭代器等。
</p><p><code>std::array</code> 满足<a href="../named_req/Container.html" title="cpp/named req/Container"><i>容器</i> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(Container)</span> </a>和<a href="../named_req/ReversibleContainer.html" title="cpp/named req/ReversibleContainer"><i>可逆容器</i> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(ReversibleContainer)</span> </a>的要求，除了默认构造的 array 是非空的，以及进行交换的复杂度是线性，它<span class="t-rev-inl t-since-cxx17"><span>满足<a href="../named_req/ContiguousContainer.html" title="cpp/named req/ContiguousContainer"><i>连续容器</i> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(ContiguousContainer)</span> </a></span> <span><span class="t-mark-rev t-since-cxx17">(C++17 起)</span></span></span>的要求并部分满足<a href="../named_req/SequenceContainer.html" title="cpp/named req/SequenceContainer"><i>序列容器</i> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(SequenceContainer)</span> </a>的要求。
</p><p>当其长度为零时 <code>array</code> （ <code>N == 0</code> ）有特殊情况。此时， <span class="t-c"><span class="mw-geshi cpp source-cpp">array.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> array.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span></span></span> ，并拥有某个唯一值。在零长 <code>array</code> 上调用 <span class="t-c"><span class="mw-geshi cpp source-cpp">front<span class="br0">(</span><span class="br0">)</span></span></span> 或 <span class="t-c"><span class="mw-geshi cpp source-cpp">back<span class="br0">(</span><span class="br0">)</span></span></span> 是未定义的。
</p><p>亦可将 <code>array</code> 当做拥有 <code>N</code> 个同类型元素的元组。
</p>
<h3><span class="mw-headline" id=".E8.BF.AD.E4.BB.A3.E5.99.A8.E9.9D.9E.E6.B3.95.E5.8C.96">迭代器非法化</span></h3>
<p>按照规则，指向 <code>array</code> 的迭代器在 <code>array</code> 的生存期间决不非法化。然而要注意，在 <a href="array/swap.html" title="cpp/container/array/swap">swap</a> 时，迭代器将继续指向同一 <code>array</code> 的元素，并将改变元素的值。
</p>
<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E7.B1.BB.E5.9E.8B">成员类型</span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc-sep">
<td colspan="2">  
</td></tr>
<tr class="t-dsc-hitem">
<td>  成员类型
</td>
<td>  定义
</td></tr>


<tr class="t-dsc">
<td>  <code>value_type</code>
</td>
<td>  <code>T</code> </td></tr>

<tr class="t-dsc">
<td>  <code>size_type</code>
</td>
<td>  <span class="t-lc"><a href="../types/size_t.html" title="cpp/types/size t">std::size_t</a></span> </td></tr>

<tr class="t-dsc">
<td>  <code>difference_type</code>
</td>
<td>  <span class="t-lc"><a href="../types/ptrdiff_t.html" title="cpp/types/ptrdiff t">std::ptrdiff_t</a></span> </td></tr>

<tr class="t-dsc">
<td>  <code>reference</code>
</td>
<td>  <code>value_type&amp;</code> </td></tr>

<tr class="t-dsc">
<td>  <code>const_reference</code>
</td>
<td>  <code>const value_type&amp;</code> </td></tr>

<tr class="t-dsc">
<td>  <code>pointer</code>
</td>
<td>  <code>value_type*</code></td></tr>

<tr class="t-dsc">
<td>  <code>const_pointer</code>
</td>
<td>  <code>const value_type*</code></td></tr>

<tr class="t-dsc">
<td>  <code>iterator</code>
</td>
<td>  <a href="../named_req/RandomAccessIterator.html" title="cpp/named req/RandomAccessIterator"><i>遗留随机访问迭代器</i> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(LegacyRandomAccessIterator)</span> </a><span class="t-rev-inl t-since-cxx20"><span>兼<a href="../named_req/ConstexprIterator.html" title="cpp/named req/ConstexprIterator"><i>常量表达式迭代器</i> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(ConstexprIterator)</span> </a></span> <span><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></span></span><span class="t-rev-inl t-since-cxx17"><span>且为<a href="../named_req/LiteralType.html" title="cpp/named req/LiteralType"><i>字面类型</i> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(LiteralType)</span> </a></span> <span><span class="t-mark-rev t-since-cxx17">(C++17 起)</span></span></span></td></tr>

<tr class="t-dsc">
<td>  <code>const_iterator</code>
</td>
<td>  常随机访问迭代器<span class="t-rev-inl t-since-cxx20"><span>兼<a href="../named_req/ConstexprIterator.html" title="cpp/named req/ConstexprIterator"><i>常量表达式迭代器</i> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(ConstexprIterator)</span> </a></span> <span><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></span></span><span class="t-rev-inl t-since-cxx17"><span>且为<a href="../named_req/LiteralType.html" title="cpp/named req/LiteralType"><i>字面类型</i> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(LiteralType)</span> </a></span> <span><span class="t-mark-rev t-since-cxx17">(C++17 起)</span></span></span> </td></tr>

<tr class="t-dsc">
<td>  <code>reverse_iterator</code>
</td>
<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../iterator/reverse_iterator.html"><span class="kw658">std::<span class="me2">reverse_iterator</span></span></a><span class="sy1">&lt;</span>iterator<span class="sy1">&gt;</span></span></span> </td></tr>

<tr class="t-dsc">
<td>  <code>const_reverse_iterator</code>
</td>
<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../iterator/reverse_iterator.html"><span class="kw658">std::<span class="me2">reverse_iterator</span></span></a><span class="sy1">&lt;</span>const_iterator<span class="sy1">&gt;</span></span></span> </td></tr>
</table>
<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E5.87.BD.E6.95.B0">成员函数</span></h3>
<table class="t-dsc-begin">


<tr>
<td colspan="2"> <h5> <span class="mw-headline" id=".E9.9A.90.E5.BC.8F.E5.AE.9A.E4.B9.89.E7.9A.84.E6.88.90.E5.91.98.E5.87.BD.E6.95.B0">  隐式定义的成员函数 </span></h5>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div t-dsc-member-nobold-div"><div><span class="t-lines"><span>(构造函数)</span></span></div><div><span class="t-lines"><span><span class="t-mark">(隐式声明)</span></span></span></div></div>
</td>
<td>  遵循<a href="../language/aggregate_initialization.html" title="cpp/language/aggregate initialization">聚合初始化</a>的规则初始化 <code>array</code> （注意默认初始化可以导致非类的 <code>T</code> 的不确定值） <br> <span class="t-mark">(公开成员函数)</span>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div t-dsc-member-nobold-div"><div><span class="t-lines"><span>(析构函数)</span></span></div><div><span class="t-lines"><span><span class="t-mark">(隐式声明)</span></span></span></div></div>
</td>
<td>  销毁 <code>array</code> 的每个元素 <br> <span class="t-mark">(公开成员函数)</span>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>operator=</span></span></div><div><span class="t-lines"><span><span class="t-mark">(隐式声明)</span></span></span></div></div>
</td>
<td>   以来自另一 <code>array</code> 的每个元素重写 <code>array</code> 的对应元素 <br> <span class="t-mark">(公开成员函数)</span>
</td></tr>


<tr>
<td colspan="2"> <h5> <span class="mw-headline" id=".E5.85.83.E7.B4.A0.E8.AE.BF.E9.97.AE">  元素访问 </span></h5>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="array/at.html" title="cpp/container/array/at"> <span class="t-lines"><span>at</span></span></a></div></div>
</td>
<td>  访问指定的元素，同时进行越界检查  <br> <span class="t-mark">(公开成员函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="array/operator_at.html" title="cpp/container/array/operator at"> <span class="t-lines"><span>operator[]</span></span></a></div></div>
</td>
<td>   访问指定的元素  <br> <span class="t-mark">(公开成员函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="array/front.html" title="cpp/container/array/front"> <span class="t-lines"><span>front</span></span></a></div></div>
</td>
<td>  访问第一个元素 <br> <span class="t-mark">(公开成员函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="array/back.html" title="cpp/container/array/back"> <span class="t-lines"><span>back</span></span></a></div></div>
</td>
<td>   访问最后一个元素  <br> <span class="t-mark">(公开成员函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="array/data.html" title="cpp/container/array/data"> <span class="t-lines"><span>data</span></span></a></div></div>
</td>
<td>  返回指向内存中数组第一个元素的指针  <br> <span class="t-mark">(公开成员函数)</span> </td></tr>


<tr>
<td colspan="2"> <h5> <span class="mw-headline" id=".E8.BF.AD.E4.BB.A3.E5.99.A8">  迭代器 </span></h5>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="array/begin.html" title="cpp/container/array/begin"> <span class="t-lines"><span>begin</span><span> cbegin</span></span></a></div><div><span class="t-lines"><span></span><span></span></span></div></div>
</td>
<td>   返回指向容器第一个元素的迭代器  <br> <span class="t-mark">(公开成员函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="array/end.html" title="cpp/container/array/end"> <span class="t-lines"><span>end </span><span>cend</span></span></a></div><div><span class="t-lines"><span></span><span></span></span></div></div>
</td>
<td>  返回指向容器尾端的迭代器  <br> <span class="t-mark">(公开成员函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="array/rbegin.html" title="cpp/container/array/rbegin"> <span class="t-lines"><span>rbegin</span><span> crbegin</span></span></a></div><div><span class="t-lines"><span></span><span></span></span></div></div>
</td>
<td>  返回指向容器最后元素的逆向迭代器  <br> <span class="t-mark">(公开成员函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="array/rend.html" title="cpp/container/array/rend"> <span class="t-lines"><span>rend</span><span> crend</span></span></a></div><div><span class="t-lines"><span></span><span></span></span></div></div>
</td>
<td>   返回指向前端的逆向迭代器  <br> <span class="t-mark">(公开成员函数)</span> </td></tr>


<tr>
<td colspan="2"> <h5> <span class="mw-headline" id=".E5.AE.B9.E9.87.8F">  容量 </span></h5>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="array/empty.html" title="cpp/container/array/empty"> <span class="t-lines"><span>empty</span></span></a></div></div>
</td>
<td>   检查容器是否为空  <br> <span class="t-mark">(公开成员函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="array/size.html" title="cpp/container/array/size"> <span class="t-lines"><span>size</span></span></a></div></div>
</td>
<td>   返回容纳的元素数  <br> <span class="t-mark">(公开成员函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="array/max_size.html" title="cpp/container/array/max size"> <span class="t-lines"><span>max_size</span></span></a></div></div>
</td>
<td>  返回可容纳的最大元素数 <br> <span class="t-mark">(公开成员函数)</span> </td></tr>


<tr>
<td colspan="2"> <h5> <span class="mw-headline" id=".E6.93.8D.E4.BD.9C">  操作 </span></h5>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="array/fill.html" title="cpp/container/array/fill"> <span class="t-lines"><span>fill</span></span></a></div></div>
</td>
<td>   以指定值填充容器  <br> <span class="t-mark">(公开成员函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="array/swap.html" title="cpp/container/array/swap"> <span class="t-lines"><span>swap</span></span></a></div></div>
</td>
<td>   交换内容  <br> <span class="t-mark">(公开成员函数)</span> </td></tr>
</table>
<h3><span class="mw-headline" id=".E9.9D.9E.E6.88.90.E5.91.98.E5.87.BD.E6.95.B0">非成员函数</span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="array/operator_cmp.html" title="cpp/container/array/operator cmp"> <span class="t-lines"><span>operator==</span><span>operator!=</span><span>operator&lt;</span><span>operator&lt;=</span><span>operator&gt;</span><span>operator&gt;=</span><span>operator&lt;=&gt;</span></span></a></div><div><span class="t-lines"><span></span><span><span class="t-mark-rev t-until-cxx20">(C++20 中移除)</span></span><span><span class="t-mark-rev t-until-cxx20">(C++20 中移除)</span></span><span><span class="t-mark-rev t-until-cxx20">(C++20 中移除)</span></span><span><span class="t-mark-rev t-until-cxx20">(C++20 中移除)</span></span><span><span class="t-mark-rev t-until-cxx20">(C++20 中移除)</span></span><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div>
</td>
<td>   按照字典顺序比较 array 中的值 <br> <span class="t-mark">(函数模板)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="array/get.html" title="cpp/container/array/get"> <span class="t-lines"><span>std::get<span class="t-dsc-small">(std::array)</span></span></span></a></div></div>
</td>
<td>   访问 <code>array</code> 的一个元素  <br> <span class="t-mark">(函数模板)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="array/swap2.html" title="cpp/container/array/swap2"> <span class="t-lines"><span>std::swap<span class="t-dsc-small">(std::array)</span></span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>   特化 <span class="t-lc"><a href="../algorithm/swap.html" title="cpp/algorithm/swap">std::swap</a></span> 算法 <br> <span class="t-mark">(函数模板)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="array/to_array.html" title="cpp/container/array/to array"> <span class="t-lines"><span>to_array</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div>
</td>
<td>   从内建数组创建 <code>std::array</code> 对象  <br> <span class="t-mark">(函数模板)</span> </td></tr>
</table>
<h3><span class="mw-headline" id=".E8.BE.85.E5.8A.A9.E7.B1.BB">辅助类</span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="array/tuple_size.html" title="cpp/container/array/tuple size"> <span class="t-lines"><span>std::tuple_size<span class="t-dsc-small">&lt;std::array&gt;</span></span></span></a></div></div>
</td>
<td>  获得 <code>array</code> 的大小  <br> <span class="t-mark">(类模板特化)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="array/tuple_element.html" title="cpp/container/array/tuple element"> <span class="t-lines"><span>std::tuple_element<span class="t-dsc-small">&lt;std::array&gt;</span></span></span></a></div></div>
</td>
<td>   获得 <code>array</code> 元素的类型  <br> <span class="t-mark">(类模板特化)</span> </td></tr>
</table>
<h3><span class="mw-headline" id=".E6.8E.A8.E5.AF.BC.E6.8C.87.E5.BC.95.28C.2B.2B17_.E8.B5.B7.29"><a href="array/deduction_guides.html" title="cpp/container/array/deduction guides">推导指引</a><span class="t-mark-rev t-since-cxx17">(C++17 起)</span></span></h3>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
<div class="t-example"><div class="t-example-live-link"><div class="coliru-btn coliru-btn-run-init">运行此代码</div></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="cpp source-cpp"><pre class="de1"><span class="co2">#include &lt;string&gt;</span>
<span class="co2">#include &lt;iterator&gt;</span>
<span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;algorithm&gt;</span>
<span class="co2">#include &lt;array&gt;</span>
 
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
    <span class="co1">// 用聚合初始化构造</span>
    std<span class="sy4">::</span><span class="me2">array</span><span class="sy1">&lt;</span><span class="kw4">int</span>, <span class="nu0">3</span><span class="sy1">&gt;</span> a1<span class="br0">{</span> <span class="br0">{</span><span class="nu0">1</span>, <span class="nu0">2</span>, <span class="nu0">3</span><span class="br0">}</span> <span class="br0">}</span><span class="sy4">;</span> <span class="co1">// CWG 1270 重申前的 C++11 中要求双花括号</span>
                                        <span class="co1">// （ C++11 之后的版本和 C++14 起不要求）</span>
    std<span class="sy4">::</span><span class="me2">array</span><span class="sy1">&lt;</span><span class="kw4">int</span>, <span class="nu0">3</span><span class="sy1">&gt;</span> a2 <span class="sy1">=</span> <span class="br0">{</span><span class="nu0">1</span>, <span class="nu0">2</span>, <span class="nu0">3</span><span class="br0">}</span><span class="sy4">;</span>  <span class="co1">// = 后决不要求</span>
    std<span class="sy4">::</span><span class="me2">array</span><span class="sy1">&lt;</span><a href="../string/basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a>, <span class="nu0">2</span><span class="sy1">&gt;</span> a3 <span class="sy1">=</span> <span class="br0">{</span> <a href="../string/basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a><span class="br0">(</span><span class="st0">"a"</span><span class="br0">)</span>, <span class="st0">"b"</span> <span class="br0">}</span><span class="sy4">;</span>
 
    <span class="co1">// 支持容器操作</span>
    <a href="../algorithm/sort.html"><span class="kw1617">std::<span class="me2">sort</span></span></a><span class="br0">(</span>a1.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>, a1.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
    <a href="../algorithm/reverse_copy.html"><span class="kw1602">std::<span class="me2">reverse_copy</span></span></a><span class="br0">(</span>a2.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>, a2.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span>, 
                      <a href="../iterator/ostream_iterator.html"><span class="kw670">std::<span class="me2">ostream_iterator</span></span></a><span class="sy1">&lt;</span><span class="kw4">int</span><span class="sy1">&gt;</span><span class="br0">(</span><a href="../io/cout.html"><span class="kw1757">std::<span class="me2">cout</span></span></a>, <span class="st0">" "</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
 
    <a href="../io/cout.html"><span class="kw1757">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
 
    <span class="co1">// 支持带范围 for 循环</span>
    <span class="kw1">for</span><span class="br0">(</span><span class="kw4">const</span> <span class="kw4">auto</span><span class="sy3">&amp;</span> s<span class="sy4">:</span> a3<span class="br0">)</span>
        <a href="../io/cout.html"><span class="kw1757">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> s <span class="sy1">&lt;&lt;</span> <span class="st0">' '</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div></div>
<p>输出：
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="text source-text"><pre class="de1">3 2 1 
a b</pre></div></div> 
</div>
<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="../experimental/make_array.html" title="cpp/experimental/make array"> <span class="t-lines"><span>make_array</span></span></a></div></div>
</td>
<td>   创建 <span class="t-lc"><strong class="selflink">std::array</strong></span> 对象，从参数推导出其大小和可选的元素类型 <br> <span class="t-mark">(函数模板)</span> </td></tr>
</table>

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